Raninoidea
Encyclopedia
Raninoida is a taxonomic section of the crab
s, containing a single superfamily, Raninoidea. This group of crabs is unlike most, with the abdomen
not being folded under the thorax
. It comprises 46 extant species, and nearly 200 species known only from fossil
s .
Crab
True crabs are decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail" , or where the reduced abdomen is entirely hidden under the thorax...
s, containing a single superfamily, Raninoidea. This group of crabs is unlike most, with the abdomen
Abdomen
In vertebrates such as mammals the abdomen constitutes the part of the body between the thorax and pelvis. The region enclosed by the abdomen is termed the abdominal cavity...
not being folded under the thorax
Thorax
The thorax is a division of an animal's body that lies between the head and the abdomen.-In tetrapods:...
. It comprises 46 extant species, and nearly 200 species known only from fossil
Fossil
Fossils are the preserved remains or traces of animals , plants, and other organisms from the remote past...
s .